Hypoglycaemia

Glucose <4 mmol/L

Red flags
  • Coma / seizure
  • Sulfonylurea overdose (recurrent hypos)
  • Neonatal hypoglycaemia

First steps

  • Capillary glucose confirm
  • Conscious + swallow: fast-acting carb 15-20 g PO
  • Unconscious/NBM: 20% dextrose 100 mL IV OR 10% 250 mL IV OR glucagon 1 mg IM

Key investigations

  • Serum glucose
  • C-peptide, insulin, cortisol if unclear (send during hypo)

Differentials

  • Insulin/sulfonylurea overdose
  • Alcohol
  • Adrenal insufficiency
  • Insulinoma
  • Post-bariatric

Initial management

  • Long-acting carb after correction
  • Sulfonylurea: consider octreotide 50 mcg SC + admit
  • Address cause: diet, insulin adjustment

Referral

  • Diabetes specialist if recurrent
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